diff --git a/parse.c b/parse.c
index 2c0fc1ad5..b4c4fdd56 100644
--- a/parse.c
+++ b/parse.c
@@ -42,6 +42,7 @@
 #endif /* HAVE_UNISTD_H */
 #include <ctype.h>
 #include <pwd.h>
+#include <grp.h>
 
 #include "sudo.h"
 #include "parse.h"